I'll also have to cast my vote for 600 A.D. A lot about it, especially the church, Magus' lair, the sinkhole, the place with that ghost, the ruins of what used to be the Reptite city, the fake Chancellor, and probably more that I'd remember if I'd played recently, is just so creepy. Especially that church, those monsters disguised as nuns even creep me out as an adult. In fact, thinking about it makes me want to play the game again now. Like I'm not busy enough, thanks a lot =/